GUARANTOR - Condensed Income Statement (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
NET REVENUES	$ 123,207,000	$ 120,457,000	$ 120,478,000	$ 96,103,000	$ 117,704,000	$ 114,662,000	$ 100,592,000	$ 78,420,000	$ 460,245,000	$ 411,378,000	$ 379,789,000
Operating Expenses Abstract
Depreciation Depletion And Amortization									9,793,000	8,419,000	7,794,000	$ 7,794,000
General and Administrative Expense									33,328,000	26,479,000	26,572,000
Acquisition Costs									708,000	6,836,000	1,042,000
OtherCostAndExpenseOperating									565,000	0	0
Net (gain) loss on sale or disposal of assets									(1,621,000)	(2,364,000)	(379,000)
Operating Expenses									362,188,000	325,796,000	294,213,000
Operating Income Loss	30,040,000	25,688,000	27,584,000	14,745,000	32,555,000	23,159,000	20,615,000	9,253,000	98,057,000	85,582,000	85,576,000
Other income									(2,299,000)	0	0	0
TOTAL OTHER (INCOME) EXPENSE									8,559,000	0	21,000
INCOME (LOSS) BEFORE INCOME TAXES (BENEFIT)									52,859,000	47,621,000	46,734,000
Income Tax Expense (Benefit)									14,794,000	18,437,000	19,911,000
Net Income (Loss) Attributable to Parent	11,399,000	11,420,000	10,834,000	4,412,000	14,088,000	8,442,000	6,747,000	(93,000)	38,065,000	29,184,000	26,823,000	$ 26,823,000
Preferred stock dividend	550,000	413,000	413,000	412,000	413,000	0	0	0	1,901,000	752,000	0
Net Income (Loss) Available to Common Stockholders, Basic	$ 10,849,000	$ 10,894,000	$ 10,422,000	$ 3,999,000	$ 13,675,000	$ 8,103,000	$ 6,747,000	$ (93,000)	36,164,000	28,432,000	26,823,000
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
NET REVENUES									2,131,000	1,536,000	1,309,000
Operating Expenses Abstract
Depreciation Depletion And Amortization									1,235,000	1,123,000	1,217,000
General and Administrative Expense									33,218,000	26,395,000	26,463,000
Acquisition Costs									708,000	6,836,000	1,042,000
OtherCostAndExpenseOperating									565,000	0	0
Net (gain) loss on sale or disposal of assets									(601,000)	(601,000)	(601,000)
Operating Expenses									35,125,000	33,753,000	28,121,000
Operating Income Loss									(32,994,000)	(32,217,000)	(26,812,000)
Net interest expense, including amortization of deferred financing expense									24,000	0	15,000
Other income									100,000	0	0
Income from equity investment in subsidiaries									(85,977,000)	(79,838,000)	(73,561,000)
TOTAL OTHER (INCOME) EXPENSE									(85,853,000)	(79,838,000)	(73,546,000)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFIT)									52,859,000	47,621,000	46,734,000
Income Tax Expense (Benefit)									14,794,000	18,437,000	19,911,000
Net Income (Loss) Attributable to Parent									38,065,000	29,184,000	26,823,000
Preferred stock dividend									(1,901,000)	(752,000)	0
Net Income (Loss) Available to Common Stockholders, Basic									$ 36,164,000	$ 28,432,000	$ 26,823,000